Electrical
Charge Time Calculator
Estimate battery and EV charging time from capacity, start/end charge, charger current or power, efficiency, and taper. Also estimate energy drawn, charging cost, and finish time.
Charging Time Estimator for Batteries, Devices and EVs
Choose a mode, enter capacity and charger details, and get a practical time estimate that accounts for tapering and losses.
This mode estimates time from amp-hours. The taper factor accounts for current tapering near full and other real-world slowdowns.
Energy-based estimates are often the easiest for comparing chargers. Enter capacity as Wh/kWh, then enter charger power in W/kW.
EV charging time depends strongly on the vehicle’s charging curve. This mode estimates time using energy and a taper factor, and is most reliable below ~80% SoC.
Use this tab if you already know your “energy from wall” and the expected duration. It estimates total cost and a finish time. For best results, copy energy and time from the other tabs.